/Engine/Source/Runtime/GeometryCore/Public/Implicit/CachingMeshSDF.h
What counts as "inside" the mesh. Crossing count does not use triangle Orientation, so inverted faces are fine, but overlapping shells or self intersections will be filled using even/odd rules (as seen along X axis...) Winding count is basically mesh winding number, handles overlap shells and self-intersections, but inverted shells are 'subtracted', and inverted faces are a disaster. Both modes handle internal cavities, neither handles open sheets.
enum EInsideModes { CrossingCount = 0, WindingCount = 1, }